2026-10-08 · 5 min read
Mitsubishi Xpander Spark Plugs Malaysia — 4A91
4A91 1.5L: NGK ILKAR7L11 iridium or BKR5E copper, 4 plugs. Copper plugs every 40,000 km; iridium every 60,000 km. Port injection engine — plugs don't foul as quickly as direct injection. Access is straightforward from the top of the engine bay. Misfires from worn plugs: rough idle, hesitation on acceleration, P030X codes. Iridium upgrade recommended for longer intervals.
4A91 1.5L: NGK ILKAR7L11 iridium or BKR5E copper, 4 plugs. Copper plugs every 40,000 km; iridium every 60,000 km. Port injection engine — plugs don't foul as quickly as direct injection. Access is straightforward from the top of the engine bay. Misfires from worn plugs: rough idle, hesitation on acceleration, P030X codes. Iridium upgrade recommended for longer intervals.